The daily design sanitary sewage flow for residential occupancy is calculated from which source?

• A. From Table 8.2.1.3.A.
• B. From a fixed per-capita value
• C. From the rate of rainfall
• D. From the house size

Answer: (A)

The main idea is that residential wastewater flow used for design is taken from a standard reference table that assigns a daily volume based on occupancy characteristics, not a single generic value. This table (Table 8.2.1.3.A) standardizes how much wastewater is expected for a given residential occupancy, reflecting typical household usage patterns and fixture counts. It provides a consistent basis for sizing components like septic tanks and leach fields. Using a fixed per-capita value would be too crude and ignore variations in occupancy and fixture usage, rainfall affects only stormwater and infiltrated runoff, not sanitary sewage, and house size doesn’t reliably predict wastewater generation.